CN113637250A - Polymer composition for container cover and container cover - Google Patents
Polymer composition for container cover and container cover Download PDFInfo
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- CN113637250A CN113637250A CN202110963033.6A CN202110963033A CN113637250A CN 113637250 A CN113637250 A CN 113637250A CN 202110963033 A CN202110963033 A CN 202110963033A CN 113637250 A CN113637250 A CN 113637250A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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Abstract
The invention provides a polymer composition for a container cover and the container cover, wherein the polymer composition comprises the following components in percentage by weight: 35-80% of first polyethylene, 5-20% of second polyethylene, 10-40% of polypropylene, 1-10% of polyethylene glycol and 0.1-0.5% of antioxidant, wherein the first polyethylene comprises high-density polyethylene, and the second polyethylene comprises at least one of low-density polyethylene, linear low-density polyethylene and metallocene linear low-density polyethylene. The polymer composition has a proper melt flow index, so that the polymer composition can be subjected to injection molding under the conventional process conditions to form a container cover, the injection molding equipment and a mold are prevented from being damaged due to injection molding under the high-temperature and high-pressure conditions, and the polymer composition also has proper rigidity, environmental stress cracking resistance and low-temperature impact resistance, and meets the use requirements of agricultural bottle caps.
Description
Technical Field
The invention relates to a material for a container cover, in particular to a polymer composition for the container cover and the container cover.
Background
The bottle cap of the agricultural chemical packaging bottle (hereinafter referred to as agricultural chemical bottle cap) has higher requirements on the performance of the material. In the prior art, some manufacturers use hollow blow molding high-density polyethylene (HDPE) for producing bottle bodies to perform injection molding on agricultural bottle caps, the Environmental Stress Cracking Resistance (ESCR) of the agricultural bottle caps can meet the use requirements, but the flowability of the blow molding high-density polyethylene is poor, a high-temperature and high-pressure injection molding process is required during injection molding, the damage to an injection molding machine and a mold is large, and the problems of long molding period, high energy consumption and poor economical efficiency exist. Other manufacturers adopt injection-molded high-density polyethylene for producing common beverage bottle caps, the flowability of the polyethylene is good, the polyethylene can be molded by adopting a conventional injection molding process, but the ESCR of the finally molded bottle cap cannot completely meet the requirement of an agricultural bottle cap, and the cracking phenomenon is easy to occur. And other manufacturers adopt polypropylene (PP) to produce the agricultural bottle caps, the flowability of the material and the ESCR of the final product can meet the requirements, but the low-temperature falling performance of the product cannot meet the use requirements of the agricultural bottle caps. Some manufacturers adopt injection-molded low-density polyethylene (LDHE) to form bottle caps by injection molding, although ESCR, processability and low-temperature drop performance of the bottle caps can meet the requirements, the rigidity of the bottle caps is insufficient, and the requirements of agricultural bottle caps on torsion are difficult to meet.
Therefore, it is necessary to provide a special material for agricultural bottle caps, which has high ESCR, high rigidity, good low-temperature impact performance, good fluidity and convenient injection molding.
Disclosure of Invention
The invention aims to provide a polymer composition for a container cover and the container cover, wherein the polymer composition has proper fluidity, can be used for forming the bottle cover by injection molding under the conventional injection molding condition, and the ESCR, the rigidity and the low-temperature impact property of the bottle cover meet the using requirements.
In order to achieve the above object, the present invention provides a polymer composition for a container lid, comprising the following components in percentage by weight:
wherein the first polyethylene comprises a high density polyethylene and the second polyethylene comprises at least one of a low density polyethylene, a linear low density polyethylene, and a metallocene linear low density polyethylene.
Optionally, the polymer composition comprises the following components in percentage by weight:
optionally, the polymer composition is obtained by twin-screw extrusion of the first polyethylene, the second polyethylene, polypropylene, polyethylene glycol and the antioxidant.
Optionally, the polymer composition for the container cover has a melt flow index of 4.5g/10min to 6.5g/10min, a flexural modulus of 850MPa to 950MPa, and an impact strength of a notched simple beam of 2.5KJ/m at-30 ℃2～5.5KJ/m2。
Optionally, the first polyethylene has a melt flow index of 0.1g/10min to 10g/10 min; the melt flow index of the second polyethylene is 1g/10 min-10 g/10 min; the melt flow index of the polypropylene is 1g/10 min-10 g/10 min.
Optionally, the type of polypropylene is at least one of a co-polypropylene or a homo-polypropylene.
Optionally, the polyethylene glycol has a molecular weight of 4000 to 20000.
Optionally, the antioxidant comprises a hindered phenolic antioxidant and/or a phosphite antioxidant.
Optionally, the antioxidant comprises a hindered phenol antioxidant and a phosphite antioxidant, and the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 0.5-1.5: 1-2.
In order to achieve the above object, the present invention also provides a container lid, the material of which comprises the polymer composition for a container lid as described in any one of the above.
Compared with the prior art, the polymer composition for the container cover and the container cover have the following advantages:
the polymer composition for the container cover comprises the following components in percentage by weight: 35 to 80 percent of first polyethylene, 5 to 20 percent of second polyethylene, 10 to 40 percent of polypropylene, 1 to 10 percent of polyethylene glycol and 0.1 to 0.5 percent of antioxidant. The components can be extruded by a double-screw extruder to obtain the polymer composition, the melt flow index of the obtained polymer composition reaches more than 4.5g/10min, the polymer composition can be molded under the conventional process conditions, a high-temperature and high-pressure injection molding process is not needed, the damage to injection molding equipment and a mold is reduced, and a bottle cap produced by using the composition has enough rigidity, low-temperature impact performance and environmental stress cracking resistance, and meets the use requirement of an agricultural bottle cap.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Furthermore, the following description describes embodiments with one or more features, and thus does not imply that the present inventors need to implement all of the features of any embodiment at the same time, or that only some or all of the features of different embodiments may be implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.
The embodiment of the invention provides a polymer composition for a container cover, which comprises, by weight, 35% -80% of first polyethylene, 5% -20% of second polyethylene, 10% -40% of polypropylene, 1% -10% of polyethylene glycol and 0.1% -0.5% of antioxidant. Further preferably, the amount of the first polyethylene is 60 to 65 percent, the amount of the second polyethylene is 10 to 15 percent, the amount of the polypropylene is 15 to 20 percent, the amount of the polyethylene glycol is 3 to 8 percent, and the amount of the antioxidant is 0.2 to 0.3 percent by weight percentage.
Wherein the first polyethylene comprises a High Density Polyethylene (HDPE), and preferably the first polyethylene has a melt flow index of from 0.1g/10min to 10g/10 min. The second polyethylene comprises at least one of Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE) and metallocene linear low density polyethylene (mLLDPE), and preferably the melt flow index of the second polyethylene is 1g/10 min-10 g/10 min. The polypropylene may be selected from co-polypropylene and/or homo-polypropylene, and preferably the polypropylene has a melt flow index of from 1g/10min to 10g/10 min. The molecular weight of the polyethylene glycol may be in the range of 4000 to 20000. And the antioxidant comprises at least one of a hindered phenol antioxidant and a phosphite antioxidant, preferably, the antioxidant comprises both the hindered phenol antioxidant and the phosphite antioxidant, and the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 0.5-1.5: 1-2.
In the embodiment of the invention, the polymer composition is obtained by extruding and granulating the components through a double-screw extruder. The components are sheared and mixed in a double-screw extruder, and are fully mixed and uniformly dispersed in a molten state. Through performance tests on the polymer composition, the melt flow index of the polymer composition is 4.5g/10 min-6.5 g/10min, the polymer composition has good fluidity, and can be used in the conventional processInjection molding is carried out by injection molding process without high-temperature and high-pressure injection molding conditions. Moreover, the flexural modulus of the polymer composition reaches 850MPa to 950MPa, and the impact strength of the simple beam with the notch at the temperature of minus 30 ℃ reaches 2.5KJ/m2～5.5KJ/m2And the environmental stress cracking resistance can reach more than 45 h.
The polymer composition provided by the embodiment of the invention is used for manufacturing bottle caps of containers, and is particularly suitable for manufacturing bottle caps of containers for agricultural chemicals (i.e. agricultural bottle caps).
In order to make the objects, advantages and features of the present invention more apparent, the present invention will be described in further detail with reference to specific examples and comparative examples. It should be noted that the following description is only illustrative of alternative embodiments of the present invention and does not cover all embodiments, and therefore, the following embodiments should not be construed to unduly limit the present invention.
< example one >
The polymer composition of this example includes the following components in weight percent: 64.8% of High Density Polyethylene (HDPE), 10% of Linear Low Density Polyethylene (LLDPE), 20% of polypropylene copolymer (PP), 5% of polyethylene glycol (PEG) and 0.2% of antioxidant, wherein the antioxidant is formed by mixing 0.1% of hindered phenol antioxidant and 0.1% of phosphite antioxidant.
Wherein the high density polyethylene is available from Letian chemical company of Korea under the designation HD5740UA, and has a melt flow index of 4g/10min as determined in accordance with ISO1133-1 and a density of 0.955g/cm as determined in accordance with ISO1183-13. Linear low density polyethylene available from Lanzhou petrochemical company under the trade designation DFDA-7042 has a melt flow index of 2.5g/10min as determined in accordance with ISO1133-1 and a density of 0.918g/cm as determined in accordance with ISO1183-13. Polypropylene available from Yangzi petrochemicals Co., Ltd under the trade name PPB-M02-V is a copolymerized polypropylene having a melt flow index of 2g/10min as determined in accordance with ISO1133-1 and a density of 0.900g/cm as determined in accordance with ISO1183-13. Polyethylene glycol purchased from KoreaChemical company, under the trade name PEG-20000 (average molecular weight of 20000), hindered phenolic antioxidants and phosphite antioxidants are available from Basff company, wherein the hindered phenolic antioxidants are under the trade name Irganox 1010, and the phosphite antioxidants are under the trade name Irgafos 168.
All the components are mixed and then extruded and granulated by a double-screw extruder, wherein the body of the double-screw extruder comprises six sections which are axially connected, and the six sections are respectively a first section, a second section, a third section, a fourth section, a fifth section and a sixth section along the direction from a feed inlet to a discharge outlet. In the extrusion process, the temperature of the first section is 160-170 ℃, the temperature of the second section is 180-190 ℃, the temperature of the third section is 190-200 ℃, the temperature of the fourth section is 200-220 ℃, the temperature of the fifth section is 200-220 ℃, and the temperature of the sixth section is 220-240 ℃. The rotating speed of the screw is 240 rpm-250 rpm.
After the resulting polymer composition pellets were cooled, the melt flow index (MFR) of the polymer composition was determined according to the specification of ISO1133-1, the density of the polymer composition was determined according to the specification of ISO1183-1, and a sample was prepared using the polymer composition, and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specification of ISO178 and the Environmental Stress Crack Resistance (ESCR) of the test sample according to GB/T1842-2008, with the test results shown in Table 1. The ESCR test is performed by immersing a plurality of samples in a TX-10 aqueous solution at 50 ℃ and 10% by mass, observing the cracking of the samples, and determining the time for which half of the samples are cracked as the test result.
< example two >
This example differs from example one in that the specific proportions of the individual components of the polymer composition differ.
In this embodiment, the amount of the first polyethylene is 78.8%, the amount of the second polyethylene is 5%, the amount of the polypropylene is 10%, the amount of the polyethylene glycol is 5%, the amount of the hindered phenol antioxidant is 0.1%, and the amount of the phosphite antioxidant is 0.1%.
The polymer composition obtained in this example was tested for its melt flow index according to the specifications of ISO1133-1, its density was determined according to the specifications of ISO1183-1, and a sample was prepared using the polymer composition and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specifications of ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the test sample according to GB/T1842-2008, the test results being shown in Table 1.
< example three >
This example differs from example one in that the specific proportions of the individual components of the polymer composition differ.
In this embodiment, the amount of the first polyethylene is 34.8%, the amount of the second polyethylene is 20%, the amount of the polypropylene is 40%, the amount of the polyethylene glycol is 5%, the amount of the hindered phenol antioxidant is 0.1%, and the amount of the phosphite antioxidant is 0.1%.
The polymer composition obtained in this example was tested for its melt flow index according to the specifications of ISO1133-1, its density was determined according to the specifications of ISO1183-1, and a sample was prepared using the polymer composition and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specifications of ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the test sample according to GB/T1842-2008, the test results being shown in Table 1.
< example four >
This example differs from example one in that the specific proportions of the individual components of the polymer composition differ.
In this embodiment, the amount of the first polyethylene is 57.3%, the amount of the second polyethylene is 12.5%, the amount of the polypropylene is 25%, the amount of the polyethylene glycol is 5%, the amount of the hindered phenol antioxidant is 0.1%, and the amount of the phosphite antioxidant is 0.1%.
The polymer composition obtained in this example was tested for its melt flow index according to the specifications of ISO1133-1, its density was determined according to the specifications of ISO1183-1, and a sample was prepared using the polymer composition and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specifications of ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the test sample according to GB/T1842-2008, the test results being shown in Table 1.
< example five >
This example differs from example one in the type of the second polyethylene and the type of the polypropylene, and in the proportions of the components.
In this example, the second polyethylene was a low density polyethylene available from Yanshan petrochemical company under the designation LD151, and the melt flow index of the low density polyethylene was 3g/10min as determined according to ISO1133-1 and the density was 0.933g/cm as determined according to ISO1183-13. The polypropylene is purchased from Moscomita petrochemical company and has a trademark of T30S, is homopolymerized polypropylene, has a melt flow index of 3g/10min determined according to the specification of ISO1133-1, and has a density of 0.900g/cm determined according to ISO1183-13. And the dosage of the first polyethylene is 57.3%, the dosage of the second polyethylene is 12.5%, the dosage of the polypropylene is 25%, the dosage of the polyethylene glycol is 5%, the dosage of the hindered phenol antioxidant is 0.1%, and the dosage of the phosphite antioxidant is 0.1%.
The polymer composition obtained in this example was tested for its melt flow index according to the specifications of ISO1133-1, its density was determined according to the specifications of ISO1183-1, and a sample was prepared using the polymer composition and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specifications of ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the test sample according to GB/T1842-2008, the test results being shown in Table 1.
< example six >
This example differs from example one in the type of the second polyethylene and in the proportions of the components.
In this example, the second polyethylene was a metallocene linear low density polyethylene available from Mitsui chemical company, Japan, under the trade designation SP1520, which had a melt flow index of 2g/10min as determined in accordance with ISO1133-1 and a density of 0.913g/cm as determined in accordance with ISO1183-13. And the dosage of the first polyethylene is 57.3%, the dosage of the second polyethylene is 12.5%, the dosage of the polypropylene is 25%, the dosage of the polyethylene glycol is 5%, the dosage of the hindered phenol antioxidant is 0.1%, and the dosage of the phosphite antioxidant is 0.1%.
The polymer composition obtained in this example was tested for its melt flow index according to the specifications of ISO1133-1, its density was determined according to the specifications of ISO1183-1, and a sample was prepared using the polymer composition and the flexural modulus of the sample and the simple beam impact strength of the test sample were measured according to the specifications of ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the test sample according to GB/T1842-2008, the test results being shown in Table 1.
< comparative example one >
Samples were prepared from HD5740UA High Density Polyethylene (HDPE) from Letian chemical company, Korea, and the flexural modulus of the samples and the impact strength of the simple beam were measured according to ISO178 and the Environmental Stress Cracking Resistance (ESCR) of the samples was measured according to ISO179-1, and the test results are shown in Table 1.
Comparative example No. >
A sample was prepared from a polypropylene copolymer having PPB-M02-V, manufactured by Yangzi petrochemical company, and the flexural modulus of the sample and the impact strength of the simple beam were measured according to ISO178 and ISO179-1, and the Environmental Stress Cracking Resistance (ESCR) of the sample was measured according to GB/T1842-2008, the results of which are shown in Table 1.
< comparative example III >
Samples were prepared from DFDA-7042 Linear Low Density polyethylene from petrochemical corporation, Lanzhou, and the flexural modulus of the samples and the simple Beam impact strength of the samples were measured according to ISO178 and ISO179-1, and the Environmental Stress Crack Resistance (ESCR) of the samples was measured according to GB/T1842-2008, with the results shown in Table 1.
< comparative example No. >
A sample was prepared from LD151 low density polyethylene available from Yanshan petrochemical company, and the flexural modulus of the sample and the impact strength of a simple beam were measured according to ISO178 and ISO179-1, and the Environmental Stress Cracking Resistance (ESCR) of the sample was measured according to GB/T1842-2008, the results of which are shown in Table 1.
Comparative example No. five
Samples were prepared from T30S homo-polypropylene from Nongoni petrochemical company and the flexural modulus of the samples and the impact strength of the simple beam were measured according to ISO178 and ISO179-1 and the Environmental Stress Cracking Resistance (ESCR) according to GB/T1842-2008, the results of which are shown in Table 1.
< sixth comparative example >
Specimens were prepared from SP1520 metallocene linear low density polyethylene of Mitsui chemical company, Japan, and the flexural modulus of the specimens and the impact strength of the simple beam of the specimens were measured according to ISO178, and the Environmental Stress Cracking Resistance (ESCR) of the specimens was measured according to ISO179-1, and the test results are shown in Table 1.
As can be seen from Table 1, the polymer composition obtained in the embodiment of the invention has a better melt flow index, so that an agricultural bottle cap can be injection molded by a conventional injection molding process, and the damage to injection molding equipment and a mold caused by high-temperature and high-pressure injection molding conditions is avoided, and moreover, the flexural modulus, the impact performance under normal-temperature conditions and low-temperature conditions and the environmental stress cracking resistance of the polymer composition meet the use requirements.
TABLE 1
Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A polymer composition for a container cover is characterized by comprising the following components in percentage by weight:
wherein the first polyethylene comprises a high density polyethylene and the second polyethylene comprises at least one of a low density polyethylene, a linear low density polyethylene, and a metallocene linear low density polyethylene.
2. The polymer composition for a container cap according to claim 1, wherein the polymer composition comprises the following components in percentage by weight:
3. the polymer composition for a container cap according to claim 1 or 2, wherein the polymer composition is obtained by twin-screw extrusion of the first polyethylene, the second polyethylene, polypropylene, polyethylene glycol and the antioxidant.
4. The polymer composition for a container cap according to claim 1 or 2, wherein the polymer composition for a container cap has a melt flow index of 4.5g/10min to 6.5g/10min and a flexural modulus of 850MPa to 950MPa, and the impact strength of the simple beam with the notch at-30 ℃ is 2.5KJ/m2～5.5KJ/m2。
5. The polymer composition for a container cap of claim 1, wherein the first polyethylene has a melt flow index of 0.1g/10min to 10g/10 min; the melt flow index of the second polyethylene is 1g/10 min-10 g/10 min; the melt flow index of the polypropylene is 1g/10 min-10 g/10 min.
6. The polymer composition for a container cap according to claim 1 or 5, wherein the type of polypropylene is at least one of a co-polypropylene or a homo-polypropylene.
7. The polymer composition for a container cap according to claim 1, wherein the polyethylene glycol has a molecular weight of 4000 to 20000.
8. The polymer composition for a container cap of claim 1, wherein the antioxidant comprises a hindered phenolic antioxidant and/or a phosphite antioxidant.
9. The polymer composition for a container cap according to claim 8, wherein the antioxidant comprises a hindered phenol antioxidant and a phosphite antioxidant, and the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 0.5-1.5: 1-2.
10. A container lid characterized in that the material of the container lid comprises the polymer composition for a container lid according to any one of claims 1 to 9.
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| CN115991912A (en) * | 2023-01-10 | 2023-04-21 | 汕头市瑞华塑胶有限公司 | Recyclable low-temperature injection molding material |
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